Whether the host power state and migration recommendations generated by vSphere DPM are run automatically or not depends upon the power management automation level selected for the feature.

The automation level is configured under Power Management in the cluster’s Settings dialog box.
Note: The power management automation level is not the same as the DRS automation level.
Table 1. Power Management Automation Level
Option Description
Off The feature is disabled and no recommendations are made.
Manual Host power operation and related virtual machine migration recommendations are made, but not automatically run.
Automatic Host power operations are automatically run if related virtual machine migrations can all be run automatically.